I have suddenly found a significant number of those error messages on the Sitecore log of my CD server; my understanding is that this particular index does/should not exist in production, which is why those errors do not appear in my Dev an CM environments.
Question
How do I tell Sitecore to stop trying to rebuild a specific index in production only?
App_Config
and how they are updated/rebuilt is controlled by the indexing strategies: doc.sitecore.com/developers/91/…. I would recommend having a look at/sitecore/admin/showconfig.aspx
for that environment and seeing how they are configured currently.